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What Is This? (Picture)


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#1 Seahunt

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Posted 30 March 2012 - 06:15 AM

I have somewhere around 6 or 8 of these in my deep end. It is a 10 year old plaster pool. They are concave (e.g., a little crater) and will not brush off. Thanks.

http://i49.photobuck...-01509-014A.jpg

#2 Pool Clown

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Posted 30 March 2012 - 06:47 AM

Looks like black algae that has taken hold in an imperfection in the plaster surface.

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#3 Seahunt

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Posted 30 March 2012 - 10:42 AM

Ok thanks. The pool is not yet open as I took these pictures last summer. What do you recommend?

#4 waterbear

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Posted 30 March 2012 - 06:29 PM

For starters posting a full set of test results NOT done with strips. We need free chlorine. combined chlorine, pH , total alkalinity, calcium hardness, and CYA (cyanuriic acid or stabilizer). If you have black algae it usually means one of two things, either the pool was run for a long time at too low free chlorine has had too much stabilizer for a while.
I've tested more water than I ever care to think about!
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#5 Seahunt

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Posted 03 April 2012 - 05:17 AM

Ok. I will post results when I can but the pool is not yet open. As for last year, I tried to raise FC every day to 10% of of CYA. My CYA ran from 40 at the beginning of the year to around 80/90 when I closed it. Does this sound correct?

For eliminating the black algea, what is the best method? I've heard it is quite a fight. I'm thinking the brushing and laying trichlor right on the spot (since it is on the botton at the deep end) might be the best method.

Thanks again. Will be opening the pool first of May.




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